Air-heating apparatus



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J.BARTLBTVT. AIR HEATING APPARATUS.

No. 552,555. Patented Juneas., 1895..

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J. BAR'TLETT.

AIR HEATING APPARATUS.

Patented June 23, 1896.

ANDREW BLRMMM PHUTU-UHQWASHNGTOMDC UNITED STATES PATENT OFFICE.

JAMES EARTLETT, oE cLEvELAND, oHIo.

AIR-HEATING APPARATUS.

SPECIFICATION forming part of LettersPatent No. 562,565, dated June 23, 1896. Application filed January 27,11896. SeralNO- 576,963. (N model.)

Y .To all whom it may concern):

Be it known thatI, JAMES' BAR'ILETr, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Air-Heating Apparatus, of which the following is a specification.

y invention relates to that class of hotair furnaces which are designed for warming and Ventilating large buildings, kilns for drying lumber, dac.; and the invention consists in a novel construction of the fuel-chamber, a novel construction of the air-heating box or drum, and in the manner of mounting the same so as to allow for expansion and contraction without disturbing the brickwork upon which it is mounted, all as hereinafter more-fully described.

Figure l is a front elevation. Fig. 2 is a longitudinal vertical section on the line m a; of Fig. 3. Fig. 3 is a horizontal section on the line y y of Fig. 4. Fig. 4 is a transverse vertical section on the line .e e' of Fig. 3 and Figs. 5, 6, and 7 are views showing certain details, Figs. 5 and 6 being enlarged to more clearly illustrate the construction.

. The object of my invention is to produce an apparatus for warming large volumes of air for warming and Ventilating large buildings, such as school buildings, churches, court-houses, and the like, or where it is desired to Warm large volumes of air for any purpose, such as drying lumber or other material, and which at the same time shall secure a more uniform temperature by preventing the use of an excess of fuel at any one time, and to also economize in the amount of fuel used.

To accomplish these results, I make an airheating drum or box of metal, it consisting of4 v a rectangular metallic box I-I, (shown in Figs.

sarily be a large number of warm-air flues differing in length and position; but when a fan is not used, and the air is caused to move by its expansion and the draft of Ventilatingfiues alone, the ain-tubes T of the heater will tubes being set far enough from the outer walls to leave a narrow space or flue for the passage of the products of combustion, the side plates e e stopping at their lower edges a little distance from the bottom, thereby leaving an opening along each side for the products of combustion to pass under them into the space or iiue between them and the outer walls, as shown in Fig. 4.

To still further utilize the heat, I locate at each side of the box, just inside of the outer row of tubes, a verticalplate c, which extends to near the top of the box, 'as is shown in Fig. 4, so that the products of combustion are compelled to iirst pass upward among and around the tubes, then over the tops of these plates c, then downward and out under the lower edges of the plates e, thence upward between said plates and the outer walls and across the top to the smoke-pipe S, as indicated by the arrows in Fig. 4. In order to regulate the draft, a damper d is located in the smokepipe, and is provided with a handle or other means by which it can be adjusted as desired.

At one or both ends of the box holes will be made at the bottom of the space between the plates e and the outer walls, `for removing any ashes which may accumulate therein, these holes being provided with doors or removable covers, as is usual.

The heater thus constructed is mounted on brickwork B, within which the fuel-furnace is located; and to provide for the expansion and contraction of the metal heater and prevent injury to the brickwork I place upon the top of the brickwork a metallic framework composed of angle-bars I, as shown in IOO Figs. 2, 5, 6, and '7, by which there is formed a trough or recess for the reception of sand or similar material to form what is known as a sand-joint all around between the top of the brickwork and the lower edge of the metal heater H.

At each of the four corners of the metal frame I, I locate a roller r, mounted in a recess in a plate E, secured to the bars I, as shown in Figs. 5 and 6, upon which the heater H rests, as shown in Figs. 2 and 7. By this arrangement it will be seen that the metal heater H is free to move by its expansion and contraction without in any manner affecting the brickwork which supports it, the rollers permitting it to move freely, while the sand or similar loose material will make a sufficiently tight joint to prevent the escape of the products of combustion and yet yield readily to. the movements of the metallic heater.

In order tol secure a uniformity of fire and prevent the waste of fuel, I construct the furnace for the fuel as shown in Figs. 2, 3, and 4.

As shown in Fig. 2, it is located in the center or midway between the end Walls of the brickwork B, which is built in the form of a chamber much larger than the fuel-chamber or Jirebox F, thus leaving at. each side of the firebox a-large space b, as shown in Figs. 2 and 3. The fire-box is composed of brickwork up to a line with the grate-bars g, which may be of any approvedstyle, either stationary or shaking, and from that point the sides of the fire,- box are preferably composed of heavy pieces of fire-brick @,each side being preferably composed of a single block of fire-brick, as represented in Fig. 2, they extending from front to rear, as shown in Figs. 3 and et. These sides of the fire-box are of only such a` height as will containy the proper quantity of fuel for the fire required; and if, as is often the. case, the fireman puts on an excess of coal it simply falls off at the sides of the fire-box, from which it is from time to time removed through doors Z Z, at the front, provided for that purpose. It. will be, seen that by this construction I accomplish two results: first, prevent an excess of the fire yand secure a more uniforrln heat, and,second, prevent a waste of the fue By constructing the brickwork which supports the metallic heater in the form of a large chamber and locating the fire-box centrally therein, as shown, I also secure a large combustion-chamber, in which the hot gases arisingl from the burning coal can be thoroughly ignited and consumed, thereby increasing the intensity of the heat and economizing in the fuel used, air for aiding in the combustion of the gases being admitted by any of the well-known means in common use.

It will of course be understood that the fire-box F and the ash-pit P will be provided with doors, as usual, and these doors will be provided with sliding dampers or similar means for regulating the admission of air both above and below the grate, as indicated in Fig. 4, these being well-known devices, and therefore requiring no further description. It will also be understood that the apparatus as a whole will necessarily be located in different positions in different buildings, and that suitable means must be provided for conveying the air to be heated to the tubes of the heater II, and from thence to the various rooms of the building; but as these must be `varied according to circumstances, and are usually provided for by the architect or the engineer, I have not thought it necessary to show them, as my invention relates to the heating apparatus itself, an`d because any person skilled in the art will know how to arl range these adjuncts and use my invention.

I am aware that a patent has been granted for a furnace in which provision is made for the surplus fuel to fall into spaces at the sides of the fire-box, upon hinged plates, which are expected to be tipped automatically by the weight of the fuel and dump the latter into the ash-pit, and I make no claim to such construction.

I-Iaving thus fully described my invention, what I claim isl. An air-heater consisting of a drum or box having a series of open-ended tubes extending through the same, said drum or box having its top and sid-es made with double walls, the inner side walls having a slot or opening for the passage of the smoke and heat along their lower edges, with baffleplates c arranged infront of said openings and extending to near the top of the box or drum, substantially as shown and described.

2. The combinationin aheating apparatus of the enlarged combustion-chamber, and the shallow lire-box located centrally therein with chambers or spaces hat opposite sides of said fire-box, said chambers being wholly separate land disconnected from the ash-pit and havingindependent doors for the removal of the surplus fuel, whereby the amount of fuel in the fire-box is limi-ted and the surplus fuel is kept separate and apart from the ashes, substantially as shown and described.

In witness whereof I hereunto set my hand in thepresence of two witnesses.

JAMES BARTLETT.

IVitnesses E. H. EeGLEsToN, GEO. N. WEBSTER.

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